Where can the custom roll-up summary fields be created using Standard Object relationships (Choose 3)

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Where can the custom roll-up summary fields be created using Standard Object relationships (Choose 3)
A . On Opportunity using Opportunity Product records.
B . On Account using Case records.
C . On Quote using Order records.
D . On Campaign using Campaign Member records.
E . On Account using Opportunity records.

Answer: A, D, E